<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="vue2.2.js">

    </script>
</head>
<body>
<div id="app">
    <select name="fruit" v-model="selected" id="">
        <option value="">选择一个网站</option>
        <option value="www.mi.com">mi</option>
        <option value="www.google.com">google</option>
    </select>
    <div id="output">
        选择的网站是:{{selected}}
    </div>
</div>

<script>
    new Vue({
        el: "#app",
        data: {
            selected: ''
        }
    })
</script>
</body>
</html>